18+ Uragirareta S-Rank Boukensha no Ore wa, Aisuru Dorei no Kanojora to Tomoni Dorei dake no Harem Guild wo Tsukuru

Egil, an S-rank adventurer who hates the notion of "slaves," falls in love with one slave at a slave auction he was forced to attend. She was Eleanor, the former third princess of the Kingdom of Cornelia. Eleanor, a slave to Egil, begs Egil to "kill my childhood friend who sold me to a slave trader!"

Keep an eye on the estrus slaves if there is a chance! Can Egil rescue the body and mind of beautiful girl slaves and bring peace to this world...!

(Source: Shueisha, translated)